A long straight wire carrying current of 30A is placed in an external – McqOptions

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1.	A long straight wire carrying current of 30A is placed in an external uniform magnetic field of induction 4 ´ 10?4T. The magnetic field is acting parallel to the direction of current. The magnitude of the resultant magnetic induction in tesla at a point 2.0 cm away from the wire is [EAMCET 2003]
A.	10?4
B.	3 ´ 10?4
C.	5 ´ 10?4
D.	6 ´ 10?4
Answer» D. 6 ´ 10?4

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